Question

这不是我在Stack Overflow中关于此事的第一个问题。我真的需要帮助将我的地图片段缩放到当前位置。请不要以为我没有尝试任何东西。我尝试了很多。

我需要将地图缩放到当前位置和无论我多么努力地将地图缩放到另一个位置而不是当前位置。甚至不可能想到这里发生的事情。

这是我的GoogleMapsFragment.java

public class GoogleMapsFragment extends android.support.v4.app.Fragment implements LocationListener, OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    View rootView;
    private GoogleApiClient mGoogleApiClient;
    private GoogleMap map;
    private LatLng latlng;

    public GoogleMapsFragment()
    {
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        if(!isGooglePlayServiceAvailable())
        {
           return null;
        }

        if(rootView != null)
        {
            ViewGroup parent = (ViewGroup)rootView.getParent();
            if(parent != null)
            {
                parent.removeView(rootView);
            }
        }
        else
        {
            rootView = inflater.inflate(R.layout.google_maps, container, false);
            map = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map))
                    .getMap();

            SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
                    .findFragmentById(R.id.map);

            if (mapFragment != null)
                mapFragment.getMapAsync(this);

            if (mGoogleApiClient == null) {
                mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
                        .addApi(LocationServices.API).addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this).build();
                mGoogleApiClient.connect();
            }
        }

        return rootView;
    }

    @Override
    public void onLocationChanged(Location location) {

        double latitude = location.getLatitude();
        double longitude = location.getLongitude();

        LatLng latLng = new LatLng(latitude, longitude);

        map.addMarker(new MarkerOptions().position(latLng));
        map.moveCamera(CameraUpdateFactory.newLatLng(latLng));

        map.animateCamera(CameraUpdateFactory.zoomTo(15));
    }

    @Override
    public void onStatusChanged(String s, int i, Bundle bundle) {

    }

    @Override
    public void onProviderEnabled(String s) {

    }

    @Override
    public void onProviderDisabled(String s) {

    }

    private boolean isGooglePlayServiceAvailable()
    {
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity());
        if(ConnectionResult.SUCCESS == status)
        {
            return true;
        }
        else
        {
            GooglePlayServicesUtil.getErrorDialog(status, getActivity(), 0).show();
            return false;
        }
    }

    //Zoom to the current location
    public Location getMyLocation() {
        LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
        Criteria criteria = new Criteria();

        Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
        if (location != null)
        {
            map.animateCamera(CameraUpdateFactory.newLatLngZoom(
                    new LatLng(location.getLatitude(), location.getLongitude()), 13));

            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(new LatLng(location.getLatitude(), location.getLongitude())) // Sets the center of the map to location user
                    .zoom(17)                   // Sets the zoom
                    .bearing(90)                // Sets the orientation of the camera to east
                    .tilt(40)                   // Sets the tilt of the camera to 30 degrees
                    .build();                   // Creates a CameraPosition from the builder
            map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));

        }

        return location;
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        map = googleMap;

        // Zoom in, animating the camera.
        map.animateCamera(CameraUpdateFactory.zoomTo(5), 5000, null);
        map.getUiSettings().setZoomControlsEnabled(false);
        map.getUiSettings().setCompassEnabled(false);
        map.getUiSettings().setMyLocationButtonEnabled(true);
    }

    @Override
    public void onConnected(Bundle bundle) {

        LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
        Criteria criteria = new Criteria();

        Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
    }

    @Override
    public void onConnectionSuspended(int i) {
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }
    }
}

我认为我犯了一个小小的错误，它缩放到另一个地方，它甚至不在我的国家附近。

这是我缩放位置的图像。

有人请告诉我如何将地图片段缩放到当前位置。

任何形式的帮助都可能会受到赞赏。：）

〜编辑Gaurav~

在onMapReady（）

中添加了getMyLocation（）

    @Override
    public void onMapReady(GoogleMap googleMap) {
        map = googleMap;

        getMyLocation();

        // Zoom in, animating the camera.
        map.animateCamera(CameraUpdateFactory.zoomTo(5), 5000, null);
        map.getUiSettings().setZoomControlsEnabled(false);
        map.getUiSettings().setCompassEnabled(false);
        map.getUiSettings().setMyLocationButtonEnabled(true);


    }

〜编辑完整代码〜

public class GoogleMapsFragment extends android.support.v4.app.Fragment implements LocationListener, OnMapReadyCallback, GoogleApiClient.ConnectionCallbacks, GoogleApiClient.OnConnectionFailedListener {

    View rootView;
    private GoogleApiClient mGoogleApiClient;
    private GoogleMap map;
    private LatLng latlng;

    public GoogleMapsFragment()
    {
    }

    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {

        if(!isGooglePlayServiceAvailable())
        {
           return null;
        }

        if(rootView != null)
        {
            ViewGroup parent = (ViewGroup)rootView.getParent();
            if(parent != null)
            {
                parent.removeView(rootView);
            }
        }
        else
        {
            rootView = inflater.inflate(R.layout.google_maps, container, false);
            map = ((SupportMapFragment) getChildFragmentManager().findFragmentById(R.id.map))
                    .getMap();

            SupportMapFragment mapFragment = (SupportMapFragment) getChildFragmentManager()
                    .findFragmentById(R.id.map);

            if (mapFragment != null)
                mapFragment.getMapAsync(this);

            if (mGoogleApiClient == null) {
                mGoogleApiClient = new GoogleApiClient.Builder(getActivity())
                        .addApi(LocationServices.API).addConnectionCallbacks(this)
                        .addOnConnectionFailedListener(this).build();
                mGoogleApiClient.connect();
            }
        }

        return rootView;
    }

    @Override
    public void onLocationChanged(Location location) {

        double latitude = location.getLatitude();
        double longitude = location.getLongitude();

        LatLng latLng = new LatLng(latitude, longitude);

        map.addMarker(new MarkerOptions().position(latLng));
        map.moveCamera(CameraUpdateFactory.newLatLng(latLng));

        map.animateCamera(CameraUpdateFactory.zoomTo(15));
    }

    @Override
    public void onStatusChanged(String s, int i, Bundle bundle) {

    }

    @Override
    public void onProviderEnabled(String s) {

    }

    @Override
    public void onProviderDisabled(String s) {

    }

    private boolean isGooglePlayServiceAvailable()
    {
        int status = GooglePlayServicesUtil.isGooglePlayServicesAvailable(getActivity());
        if(ConnectionResult.SUCCESS == status)
        {
            return true;
        }
        else
        {
            GooglePlayServicesUtil.getErrorDialog(status, getActivity(), 0).show();
            return false;
        }
    }

    //Zoom to the current location
    public Location getMyLocation() {
        LocationManager locationManager = (LocationManager) getActivity().getSystemService(Context.LOCATION_SERVICE);
        Criteria criteria = new Criteria();

        Location location = locationManager.getLastKnownLocation(locationManager.getBestProvider(criteria, false));
        if (location != null)
        {
            map.animateCamera(CameraUpdateFactory.newLatLngZoom(
                    new LatLng(location.getLatitude(), location.getLongitude()), 13));

            CameraPosition cameraPosition = new CameraPosition.Builder()
                    .target(new LatLng(location.getLatitude(), location.getLongitude())) // Sets the center of the map to location user
                    .zoom(17)                   // Sets the zoom
                    .bearing(90)                // Sets the orientation of the camera to east
                    .tilt(40)                   // Sets the tilt of the camera to 30 degrees
                    .build();                   // Creates a CameraPosition from the builder
            map.animateCamera(CameraUpdateFactory.newCameraPosition(cameraPosition));

        }

        return location;
    }

    @Override
    public void onMapReady(GoogleMap googleMap) {
        map = googleMap;

        Location myLocation =  getMyLocation();

        LatLng latLng = new LatLng(myLocation.getLatitude(), myLocation.getLongitude());
        map.animateCamera(CameraUpdateFactory.newLatLngZoom(
                latLng
                , 15));

    }

    private LocationRequest mLocationRequest;
    private static final long INTERVAL = 1000 * 1000;
    private static final long FASTEST_INTERVAL = 1000 * 900;

    @Override
    public void onConnected(Bundle bundle) {

        mLocationRequest = new LocationRequest();
        mLocationRequest.setInterval(INTERVAL);
        mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
        mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

        LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, (com.google.android.gms.location.LocationListener) this);

    }

    @Override
    public void onConnectionSuspended(int i) {
    }

    @Override
    public void onConnectionFailed(ConnectionResult connectionResult) {
        if (mGoogleApiClient != null) {
            mGoogleApiClient.connect();
        }
    }
}

〜错误记录〜

06-16 11:23:28.180    6647-6647/com.myayubo E/AndroidRuntime﹕ FATAL EXCEPTION: main
    Process: com.myayubo, PID: 6647
    java.lang.NullPointerException
            at com.myayubo.GoogleMapsFragment.onMapReady(GoogleMapsFragment.java:151)
            at com.google.android.gms.maps.SupportMapFragment$zza$1.zza(Unknown Source)
            at com.google.android.gms.maps.internal.zzl$zza.onTransact(Unknown Source)
            at android.os.Binder.transact(Binder.java:361)
            at com.google.android.gms.maps.internal.v$a$a.a(:com.google.android.gms.alldynamite:82)
            at maps.ei.bu$6.run(Unknown Source)
            at android.os.Handler.handleCallback(Handler.java:808)
            at android.os.Handler.dispatchMessage(Handler.java:103)
            at android.os.Looper.loop(Looper.java:193)
            at android.app.ActivityThread.main(ActivityThread.java:5299)
            at java.lang.reflect.Method.invokeNative(Native Method)
            at java.lang.reflect.Method.invoke(Method.java:515)
            at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:829)
            at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:645)
            at dalvik.system.NativeStart.main(Native Method)

Answer 1

这是：

 @Override
    public void onMapReady(GoogleMap googleMap) {
        map = googleMap;

       Location myLocation =  getMyLocation();

LatLng latLng = new LatLng(myLocation.getlatitude(), myLocation.getLongitude());
 map.animateCamera(CameraUpdateFactory.newLatLngZoom(
                latLng
                , 15));
}

和

private LocationRequest mLocationRequest;
    private static final long INTERVAL = 1000 * 1000;
    private static final long FASTEST_INTERVAL = 1000 * 900;
 @Override
    public void onConnected(Bundle bundle) {

       mLocationRequest = new LocationRequest();
                mLocationRequest.setInterval(INTERVAL);
                mLocationRequest.setFastestInterval(FASTEST_INTERVAL);
                mLocationRequest.setPriority(LocationRequest.PRIORITY_BALANCED_POWER_ACCURACY);

LocationServices.FusedLocationApi.requestLocationUpdates(mGoogleApiClient, mLocationRequest, this);

    }

这将调用onLocationChanged（）;

Answer 2

尝试从getMyLocation（）

中调用onLocationChanged（）

Answer 3

首先检查您是否正在接收位置坐标值，如果尝试使用此值

 googleMap.moveCamera(CameraUpdateFactory.newLatLngZoom(latLng, 15));

这对你有用。

无法将Android地图片段缩放到当前位置

3 个答案: